The further I go the further I dig my self in.Can anybody please help with any info and or second hand part I can use.I have marked the item on the picture. It has DCGB7 marked on the item but no specs.

I am assuming it is a type of choke with extra induction windings as it has 4 wires. The main 2 wires are open circuited.

This part is the output transformer which couples the power amplifier valve to the loudspeaker's voice coil. You can either substitute it with one of the same impedance and turns ratio or have a go at rewinding the open-circuit coil.

When you say "the 2 main wires", what do you mean by "main"? Do you mean the wires that go to the speaker?

It's not unusual for those output transformers to go open circuit.

If so, the 6AQ5 valve likes a load of 5500 ohms, so you'll need a transformer with a primary of 5500 and a secondary to match the impedance of the speaker coil, such as 4 ohms or 8 ohms.

Used output transformers come up on eBay from time to time. Often as not the sellers make no claim about their operational condition, and rarely do they give (or know) the specifications, so you are usually buying a pig in a poke.

EVATCO in QLD sells a new in box universal output transformer for $55 plus shipping.

http://evatco.com.au/125SE.htm.

OK! Its an ISO audio output transformer

And yes... they fail with regular monotony especially if they are encased in pitch, or the set has Kriesler on it. I have an Astor QK on the bench that I have had to replace the OP transformer.

One of the Antique radio suppliers in the US actually supplies new bobbins for those transformers.

The most basic GO / NO GO test is to "crack" not hold a 9V battery across the primary & listen for the "snap" from the speaker.

Marc

One of the Antique radio suppliers in the US actually supplies new bobbins for those transformers.

Please let us know his contact details.

The secondary winding of the speaker transformer will be soldered to the terminals of one the 3 four pin sockets on the chassis (for the speaker). Just be carefull as all 3 sockets are exactly the same and one of them has 240 volts for the record changer. The other socket is for the record changer pick-up. Best to work out which socket is which and mark them.

Cheers.

Try http://tubesandmore.com/, think that's one, not sure about Mouser?

Marcc

Thanks for the info GTC . It was most helpful. The 2 wires that are open circuit was not the speaker but the primary. Anyway next piece of info you provided was exactly what I required -- the resistance.

I have dealt with EVATCO previously to supply me with caps and valves.They are about a 15 minute drive for me.His wife takes orders and he supplies the good info. He used to build valve amplifiers so knows a fair bit.
Posted glass and dial today. Will keep you posted.

Regards Andy

Thanks for the info GTC . It was most helpful.

Happy to be of assistance.

It's a pity transformers are so expensive these days, but there's very few people left making them, especially chokes and output transformers. Hammond in the USA has a very large range, but of course we pay for shipping and currency conversion, one way of the other, whether we import them or buy them here.

And, like speaker re-coning, tranny repairing is a dying art locally.

Look what a bit Trove trawling turned up.

http://trove.nla.gov.au/ndp/del/printArticleJpg/23239308/3?print=n.